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Plan B One-Step - How long do the side affects last?

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LousArk 4 May 2016

The most significant effects (mood swings, fatigue etc) last around a week to 2 weeks, but the lack of or irregularity of periods & cramping, nausea etc can last longer. Every woman is different. It's common to hear from women who have had irregular periods since taking Plan B, for a month or two.

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